JPH06267428A - Plasma display panel and bulkhead plate - Google Patents

Abstract

PURPOSE:To facilitate manufacture regardless of its fineness and separate display cells easily by forming a space so that the space between two plates can be 10mum or more when a bulkhead plate is sandwiched by other planar plates. CONSTITUTION:A pair of surface discharge electrodes (SX) and (SY) are formed on a front surface glass plate (FG) so that they are linearly crossed in perpendicular and parallel directions respectively. An approximately planar partition plate (PWP) having a plurality of through holes arranged in a matrix shape is formed by a metal plate. A space (VP) is formed so that a space between both plates becomes 10mum or more when the plate (PWP) is sandwiched between other plane plates. Convex parts having at least one shape selected from an island form and a linear form are formed by fixing on one side of a hole arranged part of the plate (PWP) so that all the through holes and the external space are communicated by the space (VP). Thereby, display cells can be separated certainly and resistance of exhaust air to a protective coating such as MgO can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition plate and an AC type plasma display panel using the partition plate.

[0002]

2. Description of the Related Art AC plasma displays (hereinafter referred to as P
(Abbreviated as DP) has a memory function in discharge characteristics and has been developed as an excellent discharge surface material.
High brightness and long life.

Various methods are known for constructing the PDP, but in order to make the PDP thin, it is often adopted that the front and rear plates facing each other are sealed with seal glass to form an airtight container for discharge gas. To be done. Low-priced soda lime glass is used for both front and back plates.

In a PDP having a large number of fine display cells capable of displaying an image, a square cell array in which display cells and electrodes can be easily formed is usually adopted. The discharge electrodes are divided into rows and columns, and cells are formed at the intersections of the line-shaped row and column electrodes, which are spaced apart from each other, so that a large number of cells can be independently selected. Therefore, the selection electrode is composed of the first and second electrode groups.

In the AC type, the display discharge electrodes are covered with a dielectric. This display discharge electrode can also be used as a selection electrode. Further, a selection electrode called a writing electrode can be formed separately from the display discharge electrode. The write electrode can be used as either a coated or exposed electrode. These combinations are arbitrary. In addition, a plurality of electrodes not used for selection are usually commonly connected.

There are two types of display that utilize visible light emission of discharge gas (monochromatic PDP) and one that causes fluorescent substance to emit visible light by ultraviolet rays generated by discharge (color PDP).

In a PDP having a large number of fine display cells, a partition wall is formed between the front plate and the back plate of the screen as a spacer for supporting the pressure difference between the inside and outside of the panel and defining the distance between electrodes. The space formed by the partition and the front and rear plates is used as a display cell. In order to prevent erroneous discharge between adjacent cells and color bleeding, it is preferable that the cells have a sealed structure as much as possible. This is especially true in a color PDP, which has a high driving voltage and is liable to cause erroneous discharge, and which needs to prevent color bleeding.

In forming the partition wall, a thick film technique of printing and firing a dielectric base such as glass on the front plate and the back plate is favored. In addition, JP-A-3-152830, JP-A-3-205738, JP-A-4-199442 and the like disclose methods using a perforated metal plate.

The problems of the AC type PDP are as follows. The display discharge electrode is covered with a dielectric such as glass,
A protective film such as MgO is formed on this surface. The protective film is formed by sputtering or electron beam evaporation. But,
The protective film thus formed does not have sufficient characteristics as it is. At the end of panel assembly, activation treatment such as evacuation at high temperature is required.

The gap required for filling and exhausting the gas is formed by the unavoidable unevenness caused by the formation of the partition wall and the level difference of the wiring 1
A narrow one of 0 μm or less is sufficient. However, it has been found that exhaust resistance is large at such intervals and sufficient activation processing cannot be performed.

On the other hand, it is desirable that there be no gap between cells for cell separation for preventing erroneous discharge and the like.

There are the following measures as measures against such contradictory requirements. The first is to increase the display cell pitch with respect to the size of the display discharge portion, with or without using the open type barrier ribs.

Second, an exhaust path is formed on the same plane adjacent to the display cell using the closed partition.

In the above two cases, since the ratio of the display discharge portion to the screen is small, the luminance is low, and it is not possible to reduce the display pitch to obtain a fine PDP.

Thirdly, a closed type and an open type partition are stacked and formed. This method solves the problems of the former two, but since the display discharge portion and the exhaust path are in large communication with each other, a high partition wall is required for reliable cell separation.
Since it is difficult to form high barrier ribs, it is preferable to form the barrier ribs separately, but this requires a lot of labor for formation and alignment is also required.

As described above, in the conventional fine PDP, since the exhaust path is shared with the display discharge space, it is impossible to achieve both easy and sufficient activation of the protective film and reliable separation of the display cells. . At present, it is more difficult for cells that require cell separation, such as a color PDP having a small display dot pitch and a high driving voltage.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of these problems of the prior art, and is a PDP which is easy to manufacture even with a high definition and ensures separation of display cells, and a partition used therein. The purpose is to provide a plate.

[0018]

The above object of the present invention is achieved by the following PDP. That is, according to the present invention, parallel and linear first and second electrode groups are formed in a container in which a discharge gas is hermetically sealed, and different electrode groups intersect at a predetermined interval when viewed from the display surface direction. At the position, a hole of a partition plate having a plurality of through holes that form a recess as a cross-sectional shape is arranged, and a space formed by the translucent front plate facing the large hole side of the recess and the recess However, in the AC type PDP used as the display discharge part, an exhaust space having a space of 10 μm or more is formed between the back plate and the partition plate facing the small hole side of the recess.

Further, it is achieved by the following partition plate. That is, according to the present invention, a substantially flat partition plate having a large number of through holes arranged in a matrix is formed of a metal plate, and when the partition plate is sandwiched by other flat plates, the distance between the plates is increased. Has a space of 10 μm or more, and at least one shape selected from island and line shape is provided on one side of the hole arrangement portion of the partition plate so that all the through holes and the external space are communicated by this space. The partition plate is characterized in that the convex portions are fixedly formed.

The present invention will be described in more detail below. Since the PDP of the present invention is the same as the conventional one except that the structure of the exhaust space is different, a general structure, material, forming technique and the like can be used.

The partition plate according to the present invention can be formed by any method using any inorganic material. However, it is convenient to use perforated metal plates, which are known as described in the prior art.

Since the partition plate is in close contact with the front and rear plates (hereinafter sometimes referred to as face plates), a material having a coefficient of thermal expansion similar to that of the substrate is selected. If the face plate is soft glass,
42wt% Ni-6wt% Cr-Fe alloy or 50wt%
For hard glass such as Ni-Fe alloy, 20 wt% Ni-
Preferable examples are 17 wt% Co-Fe alloy and 42 wt% Ni-Fe alloy. Furthermore, the above-exemplified metals have excellent heat resistance and heat oxidation resistance, and are 700 ° C in air.
The dimensional change due to heating up to is a small amount within the measurement error range. In addition, like ordinary metals, these metals have good workability, and when a 0.1 mm metal plate is processed by etching, display cells with a pitch of 0.15 mm or less can be formed. Finer or more complicated cells can be formed by using a plurality of metal plates, but the cost is higher than that of a single plate. Even with a single metal plate, if the mask patterns on the front and back surfaces are changed by using the above etching process, a through hole that forms a recess as a sectional shape can be easily obtained. Also, since the mechanical properties are good, even thin ones of 0.1 mm or less have good operability.

At least a part of the partition plate can be coated with an inorganic dielectric. This is to prevent a short circuit due to contact with a plurality of electrodes or a wiring circuit formed on the face plate. Of course, this is not necessary if the face plate side is covered with a dielectric coating for preventing short circuit. The dielectric coating method of the partition plate is described in detail in each of the above-mentioned patent application publications and Japanese Patent Application Laid-Open No. 4-147535, and an inorganic material containing glass that easily forms a dense layer to prevent a short circuit is used. Is preferred. Electrodes and wirings can be formed on this dielectric.

The through hole for forming the display cell according to the present invention is
The display surface side is larger than the back surface to form a recess as a cross-sectional shape. The concave shape is formed by an arbitrary line connecting the large hole on the display surface side and the small hole on the back surface side. This shape is formed by the perforated metal plate alone, or as a result of the coating dielectric, electrode wiring, phosphor, etc. being deposited on the surface thereof.

The large hole on the display surface side is preferably as large as possible in order to increase the display aperture ratio. Further, in a fine PDP, it is necessary that the minimum pitch of the display dot array is small. A partition plate using a perforated metal plate can easily form a display aperture ratio of 35% or more and a minimum cell pitch of 0.4 mm or less.

It is preferable that the small holes on the back side are small in order to increase the phosphor coating area and separate adjacent cells. However, it is preferable that this small hole is large in order to communicate with the exhaust space and reduce exhaust resistance. Therefore, there is an optimum size, but a minimum of 1
A diameter of 0 μm or more is preferable. More preferably, the diameter is 20 μm or more. Even if it is too large, the activation treatment time does not become so short, so it is not necessary to have a diameter of 150 μm or more.

The exhaust space between the partition plate and the back plate is
All the small holes are formed so as to communicate with the exhaust holes. Usually, the exhaust hole is formed at a position outside the screen of the back plate. Therefore, it is preferable that the exhaust resistance during this period is small. A spacer may be formed between the partition plate and the back plate to secure the exhaust space. When the screen is about 4 inches or less, the spacer formation position may be outside the screen. In a large screen PDP, a spacer is also formed inside the screen. This is to prevent the face plate from being greatly bent due to the pressure difference between the inside and the outside. The spacer shape inside the screen is selected from island shape or line shape and must not block the small holes of the display cell.

The design of the space between the partition plate and the back plate is as follows. For example, in the case of a PDP having a screen size of 10 inches, an exhaust spacer is required inside the screen. The spacing is preferably 10 μm or more for island-shaped spacers, and 50 μm or more for line-shaped spacers having a pitch of about 0.2 mm. More preferably, they are 20 μm and 70 μm or more, respectively. The larger the screen size, the larger the island shape and the larger the number,
Alternatively, the larger the line width and the smaller the pitch, the larger the interval and the smaller the exhaust resistance. Of course, if the formation is easy, the interval should be large.

If the number of the exhaust spacers is small, they may be formed independently of the back plate and the partition plate. When the number is large, it may be formed on one surface or both surfaces of the back plate and the back surface of the partition plate at the same time. As a forming material and method, a general material used for conventional partition walls can be applied. If a spacer is formed on the back plate, it is necessary to align the display cell small hole with the panel assembly. Since it is complicated in a fine PDP, it is convenient to form a spacer on the partition plate side.

[0030]

EXAMPLES The present invention will be described in more detail below with reference to examples. In addition, in the reference numerals used in each of the following drawings, common ones indicate similar ones. Known techniques were used for steps other than the description.

Example 1 As a material for forming a partition plate, a thickness of 0.15 mm
A wt% Ni-6 wt% Cr-Fe alloy plate was used. The through-hole array was a rectangular array with pitches of 0.66 mm and 0.22 mm, and was formed by etching.

FIG. 1 shows a partial schematic sectional view of a partition plate formed by using such a material. In the figure, PW is a partition wall, PWP is a partition plate, TH is a through hole, LH is a large hole, S
H indicates a small hole and SP indicates a spacer, respectively.

In FIG. 1, the through hole TH forms a recess in the cross-sectional shape, and the large hole LH has a diameter of 0.59 mm in the parallel direction and 0.15 mm in the vertical direction.
Is substantially rectangular, and the small holes SH are circular with a diameter of 0.15 mm. The depth of the large hole portion is about 0.11 mm. Therefore, the width of the partition wall PW separating the large hole portion of the through hole is about 0.
The bottom thickness of the recess is about 0.04 mm. As shown in FIG. 1, an exhaust spacer SP is formed on the lower surface of the metal. Spacer has a diameter of 0.25m
The columnar shape is m and the height is 0.02 mm, and the arrangement pitch is 1.98 mm in both length and width. These were formed by thick film printing of glass paste.

Example 2 FIG. 2 shows a partial schematic sectional view of a partition plate different from that of Example 1 formed by using the same partition plate forming material as in Example 1.

As shown in FIG. 2, this partition plate PWP
In, the through hole TH and the spacer SP are formed from a single metal plate. The arrangement of through holes was the same as in Example 1 and was formed by etching. It has a circular shape with a diameter of 0.15 mm and a depth of about 0.04 mm. Spacer width is about 0.07mm,
The height is about 0.11 mm, and the shape is linear in the vertical direction, and the line pitch is about 2.64 mm. Glass powder is electrodeposited on the surface using this metal plate as an electrode, and then heated to melt the glass, thereby covering almost the entire surface of the metal plate with a dense dielectric. Its thickness is about 0.015 mm.

Embodiment 3 FIG. 3 is a partial schematic sectional view showing an example of a color PDP. In the figure, FG is a front glass plate, BP is a back plate, VP is an exhaust space SX, SY is a display discharge electrode,
DL indicates a dielectric, PH indicates a phosphor, and BM indicates a light shielding layer.

As shown in FIG. 3, the front glass plate FG
, A pair of display discharge electrodes SX and SY are formed so as to cross in a line shape in the vertical and parallel directions, respectively. These are also used as the selection electrodes. The material is a transparent conductive oxide of indium-tin, and a thin Al bus line (not shown) is formed on the transparent conductive oxide to reduce the resistance. Thin film technology is used to form these. A transparent glass layer is formed by thick film printing as insulation of the cross wiring and as the covering dielectric DL. Although not shown, MgO is formed on this surface.
Was deposited by vapor deposition.

As the partition plate PWP, the one formed in Example 1 is used. A phosphor PH is provided on the inner surface of the through hole.
Further, a light shielding layer BM is formed by printing on the front surface. The thickness is about 0.01 and 0.02 mm.

The front glass plate FG, the partition plate PWP and the rear plate BP are stacked as shown in FIG.
P was constructed.

Embodiment 4 FIG. 4 is a partial schematic sectional view showing another example of the color PDP. In the figure, W is a writing electrode.

As shown in FIG. 4, the front glass plate FG
Include display discharge electrodes SX and SY which are parallel to each other in the vertical direction.
Is formed. SX shares the selection electrode and is independent, but SY is connected in common.

The partition plate is composed of two sheets, PWP1 and PWP2, and forms a recess. The partition plate formed in Example 2 is used for PWP2, and Ag which is a selection electrode is formed on the front side surface.
The writing electrodes W of the above are applied in parallel by printing. The thickness is about 0.007 mm, and the small hole portion is connected around the hole and on the inner surface. Further, a phosphor PH is coated on this. PWP1 is a straight through hole similar to the large hole portion of Example 1 using a metal plate with a thickness of 0.1 mm, and is coated with glass as in Example 2. The other construction method is the same as that of the third embodiment.

In Examples 3 to 4 described above, soda lime glass for windows was used as the front plate and the rear plate, the periphery was sealed with seal glass, and exhaust and gas were filled with the chip tube connected to the exhaust hole formed in the rear plate. Chip off to complete PDP. He-Xe (2%) gas is 350 Torr
Is. During the panel assembly, the partition plate is easy to operate and no damage or the like has occurred. It was heated to 450 ° C. in the exhaust air, and the activation treatment was performed for half the time of the conventional method. When a normal drive was performed, the characteristics were the same as the conventional one, and no erroneous discharge was observed.

Although the color PDP is shown in the above embodiment,
The same applies to a monochromatic PDP that does not use a phosphor. Although the display discharge electrode is formed on the front plate as an example, the display discharge electrode may be formed on the write electrode portion of the fourth embodiment. If display discharge electrodes are formed on each of the front plate and the partition plate, a so-called counter discharge type PDP can be formed. It is also possible to form a write electrode for selection only on the back plate. In the fourth embodiment, the display discharge electrode SY
Are commonly connected to a plurality of cells. Such an electrode can be replaced with a metal plate of PWP1, for example. Further, as is clear from FIGS. 3 and 4, the exhaust hole formation position may be on the screen portion and does not hinder the display at all.

[0045]

As described above, the present invention has the following effects. Since the display discharge space and the exhaust space are communicated with each other through the small holes, the display cells can be reliably separated and the exhaust resistance to the protective film such as MgO can be reduced. Therefore, an AC PDP having a large display aperture ratio and a small display pitch can be easily formed. Further, the activation treatment of the protective film is easy, and its characteristics are good. These PDP
Since the formation of the partition plate and its partition plate can be performed by the conventional technique, it is easy and inexpensive.

[Brief description of drawings]

FIG. 1 is a partial schematic cross-sectional view showing an example of a partition plate of the present invention.

FIG. 2 is a partial schematic cross-sectional view showing another example of the partition plate of the present invention.

FIG. 3 is a partial schematic cross-sectional view showing an example of the PDP of the present invention.

FIG. 4 is a partial schematic cross-sectional view showing another example of the PDP of the present invention.

[Explanation of symbols]

PW: partition wall, PWP: partition plate, TH: through hole, LH: large hole, SH: small hole, SP: spacer, FG: front glass plate, BP: rear plate, VP: exhaust space SX, SY:
Display discharge electrode, W: writing electrode, DL: dielectric, P
H: phosphor, BM: light-shielding layer.

Claims (2)

[Claims] 1. A parallel and linear first and second electrode group is formed in a container in which a discharge gas is hermetically sealed, and positions where different electrode groups intersect at a predetermined interval when viewed from the display surface direction. In, the hole of the partition plate having a plurality of through holes such that a recess is formed as a cross-sectional shape is arranged, and the translucent front plate facing the large hole side of the recess and the space formed by the recess are In the AC type plasma display panel used as a display discharge part, an exhaust space having a space of 10 μm or more is formed between a partition plate and a back plate facing the small hole side of the recess. 2. A substantially flat partition plate having a large number of through holes arranged in a matrix is formed of a metal plate, and when the partition plate is sandwiched by another flat plate, a distance between both plates is formed. Is 1
A space having a size of 0 μm or more is formed, and at least one shape selected from an island and a line shape is formed on one side of the hole arrangement portion of the partition plate so that all the through holes and the external space communicate with each other. A partition plate, characterized in that the portions are fixedly formed.